$(function(){
    //菜单点击
    J_iframe
    $(".J_menuItem").on('click',function(){
        var url = $(this).attr('href');
        $("#J_iframe").attr('src',url);
        return false;
    });
});


function changeFrameHeight() {
	var ifm = document.getElementById("J_iframe");
	ifm.height = document.documentElement.clientHeight;
}
window.onresize = function() {
	changeFrameHeight();
};
 
 